• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Kt-120 ?

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#104
To get anywhere with this tube the g1 needs to be driven by a low impedance source plus able to dump Miller effect, i.e the extra A-g1 varactor capacitive load without running into distortion by doing so. A cathode follower is not a solution as it cannot "pull down".

richy
 
#105
richwalters said:
To get anywhere with this tube the g1 needs to be driven by a low impedance source
richy
Click to expand...

6C19n(6S19p) is supposed to be a good low impedance driver
I thought it would be a good one to do this
but maybe not good enough

would it be a good idea to have seperate supply to screen grids
connected through chokes, instead of resistor
 

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#110
I had forgot all about this thread...:wchair:

since then, I have bought a completely wrong trafo, ofcourse :smash:


'converted' to parafeed
its far from ideal, but maybe it would still work
but I might use EL509, 6550 ...
 

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  • C3g - KT88 PSE Garter bias.jpg
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#111
kevinkr said:
By Jove, I think he's got it! 😀 YES!
Click to expand...

wow, Kevin, was that you, trying to teach me how to layout a negative bias adjust...🙄

cheers

edit...
well, you know how it is when not doing this stuff for a couple of years, and forgetting how to
and since Im not doing tube stuff 'every day', Im not sure I want to mess with negative bias
thinking of looking at it in 10 years from now, and not having clew about where or what ... 😱
 
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